Norton is a over-programmed lead weight resource hog. It's become rediculous. IMO ;-)
I would personally never use Norton software on any gaming machine, or wireless network. If you use Linksy's routers the first thing a tech will do is tell you to remove it, not disable this or that, remove it completely.
Mcafee is better then norton, but again, for a gaming machine it's stil a bit of a resource hog. I'd turn any and all off while gaming anyway
There are plenty of free programs out there that work just as well, if not better. AVG is a good example.
2 cents